基于GNSS的编队卫星相对定位模糊度解算性能分析

模糊度解算性能是影响卫星导航系统相对定位精度的决定性因素之一。针对编队卫星的星间相对定位需求,对影响模糊度解算成功率的主要因素及其作用进行了分析。通过多种场景下模糊度解算成功率的定量仿真,说明组合多种GNSS星座、增加观测频率的个数以及选取与星间基线长度相适应的电离层模型,均有利于提高模糊度解算的成功率,该结果对于相对定位性能的预测与编队卫星系统优化设计具有参考意义。

Ambiguity Resolution Performance Analysis of GNSS-Based Relative Positioning of Formation Flying Satellites

The performance of ambiguity resolution is one of the critical factors that influence the GNSS relative positioning precision. Aiming at the requirement of inter-satellite relative positioning of formation flying satellites, the main factors of success probability of ambiguity resolution and the corresponding influences are analyzed. Quantitative simulations of ambiguity resolution success probability are carried out based on various scenarios. The success probability can be improved by combing multiple GNSS constellation, increasing observation frequencies and choosing adequate ionosphere models according to the inter-satellite baseline length. The conclusions can be a reference of the relative positioning performance prediction as well as the optimal design of formation flying satellite systems.